Self-locking shore



July 3, H923. 1,46Q375 A. A. GRONROS SELF LOCKING SHORE Filed Nov. 12 1920 llW/MSSfS /4/7///V/7A6;/?0/V/705 INVENTOR.

Mam I ATTORNEY.

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".TYUNITED,STATES Patented July 3, 1923.

" ARTHUR A. esoimos, or PONTIAC, MICHIGAN. :4

sum-menus sHoRE. 7 v i Application filed November 12, 192e, sfiiiimlAeQs QQ. a.

To all w iiiomitmag ccaccrafl v Be it known that I, ARTHUR A. GRoNRos,

' a: citi zen of the United States, residing'at Pontiac, inthe county of Oakland and State of Michigan, have invented certain new and useful. Improvements in a Self -Locking Shore, of whichethe following is. a specifi- This inventionrelatesto a class ofdevices which are generally employed in shoring or propping :up? operation and including shores orpropping means capable of use as temporary supports under the floors,

beams, etcgwhen building concrete or other structure. p v c v v An object of the; invention is to 7 provide a shore orprop device ofthe character above specified which is both adjustable and self An additional objectlis to provide a de-v vice of the character specified having its various'partssoco-related as to provide a structure strengthened and reinforcedto A withstand the strains and pressures to" which i .the invention ma it may betfsubjected, and, at the same time, be of a comparatively light and durable structure.

With ,the above and other objects in view,

ing enerally in t e detailsof construction, com ination and arrangement of part's'as will 'be hereafter ointed out and explained, reference being ad to theaccompanying drawings, whereinzl U Figure 1 is a front'elevation of the shoring device constructed in accordanc with the principles of the invention,

Figure 2, is a horizontal sectional View taken on the line 2-2 of Figure 1.

Figure 3, is asimilar section taken on the line 33 of Figure 1,

Figure 4:, is a detailed, fragmentary, view illustrating the self-locking feature of the invention,

Figure 5 is a detailed sectional view showing the manner in which the locking ele ments are pivotally supported.

The invention consists broadly in longitudinal adjustable prop members formed respectively! of a frame and a supporting column therefor.

The supporting column 1 may be ofhollow pipe construction and is supported adjacent one end by a bearing block or plate 2. To the other end of the column is secured a keeper 3 consisting of a horizontally be considered as residf disposed platehavingnOtches opposite; edges to provide guideways into which fit portions of the adjustable; frame. The keeper may be of anydesirable design and is intendedto gui'dethe'prop members of the device in their adjustmentandto hold It them relativelyfspa'ced. i I v I H "The same consists of a pair of} laterally spaced strip of hangersdsecured at one end by across bar-for head block '2' upon which the load'is adapted to'rest. ,(lomiectingthe hangers of the frame at a point'bel'ow'the" road supporting block are braces; 8, extendmg f i f th fiameon. opposite sides and bent outwardly to provide'for the pasfsage'of the keeper 'therebetweenan'd its movement upiand down withintheirame. f The, hangers of the frame are preferably extended tofa sufficient distance below the braces to permit of a slight amount o f spring in order thatfthe lowermost extremitiesbf "the ha gers-may befor ed inwa dly; toward e achother for thepurpose of releasing the "s p" m ansu The" rip means consists' in ia' looped element plvotally secured to the lower end. of each hanger with its head or having a snug fittherewith as indicatedto advantage in Figure 8 of*the"draw ings. The [freeends of the loops are fastened to It is to be noted that the head 10 of one of the grips is smaller than and fits into the head of the other grip so as to embrace thecolumn from the opposite side. It is thus obvious that the column is entirely enilooped end 10 embracingthecolumn 1 and the hanger on opposite sides; theend 0f 4 the "hangerbeing-cutaway as at '11 to, re ceivethe free end. The upper edge of, each cutaway portioniis beveled to 'p'ei'rnnt of a i certainflupward movement of the element closed between the head 10 and 10 of the gripping element.

onnecting the ends of the hanger is a band or loop 12 which embraces the hangers on opposite sides and in spaced relation thereto. This hanger is supported .upon

bolts or other fastening means 13 which exr tend crosswise to the hangers 6 and provide the pivot for the loop elements. Securing nuts 14 on the ends of the bolts hold the loop 12 in place. To the bolt of one hanger the freeends of the loop are fixedly secured while the bolt of the adjacent hanger is accommodated in a slot 15 which permits a limited amount of movement between the loop and that particular hanger. The grip releasing'means includes a screw .16 threaded to one end of the loop and provided with a head 17 adapted to bear against a plate 18 fastened to the edge. of the adjacent hanger. At the outer end'of the screw a handle 19 is provided for turning the screw and advancing it either inwardly or outwardly of the loopfthus releasing orpermittingthe grip to actuate as the case meifj In the assembling of the members; the

. tr e is mounted upon the column with the j tage in on account of their tendency to spring back to their original position, they constantly exert a pull upon the grips which causes them to embrace the column more firmly therebetween, thus locking the same tothe post and rendering the members relatively immovable... At the same time it is to be noted that the angular disposition of the gripping element with respect to the hangers .is such that the forceexerted upon the grip by theldownward tendency of the frame under the pressure of a loadg'is such as to likewisecause the grip tol obtain a firmer hold upon the column. In other words, the grip automatically actuates to lock the frame against motion toward the lower end 2 of the post although permitting it to move freely in the opposite direction. Motion in the 01pposite :dire ctionwould serve to release t -va m--- n T0render the lock gripv moperative for J the purpose of facilitating adjustment of the members longitudinally of one another the handle 19 may be manually operated to force the screw inwardly against the plate 18 of the hanger arm so that the latter will be swung inwardly under continual pressure of the-rotated screw, which inward motion of the hanger serves to release the head 10 from its grip on the column.

Since the grip automatically operates to clutch the column the same will be automatically locked in any adjusted position on the frame and firmly held until released" by the manually operated release mechanisnL'While illustrated as being designed to provide an under support for floor beams, etc. it is obvious that the invention may likewise be employed as an adjustableprop or brace. capable of. use for facing timbers and other purposes. V j

Having thus described my invention what I claim as new is:-' W

In an adjustable shore including a column, a base secured to the lower end of the column, a top member slidably associated with the column toward and away from the base including ahead block and depending hangers, and a grip means associated with the lower ends of the hangers for engaging members including a U-shaped band having parallel legs pivotally -'co n nected to one hanger and a curved connecting portion emthe colum'mhmeans for releasingthe" grip bracing the other hanger, a slot and pin connection betweensaid legs and the" lastmentioned hanger,- and an adjustable member carried by the curved connecting portion for engaging the last mentioned hanger. I

In testimony whereof I affix my signature in presence of I two witnesses.

Witnesses:

PAUL Fnnnnnroxson, I'LMAR KARHANEN.

ARTHUR, Au GRONROS. 

